Welcome to iOS 13 Programming for Beginners. This book is the fourth edition of the iOS Programming for Beginners series, and has been fully updated for iOS 13, macOS 10.15 Catalina, and Xcode 11.

In this book, you will build a restaurant reservation app called Let's Eat. You will start off by exploring Xcode, Apple's programming environment, also known as its Integrated Development Environment (IDE). Next, you will start learning the foundations of Swift, the programming language used in iOS apps, and see how it is used to accomplish common programming tasks.

Once you have a solid foundation of using Swift, you will start creating the visual aspects of the Let's Eat app. During this process, you will work with storyboards and connect your app's structure together using segues.

With your user interface complete, you will then add code to implement your app's functionality. To display your data in a grid, you will use collection views, and to display your data in a list, you will use table views. You will also look at how to add basic and custom annotations on to a map. Finally, it's time to get real data; you will look at what an Application Programming Interface (API) is and how you can get actual restaurant data into your collection views, table views, and map.

You now have a complete app, but how about adding some bells and whistles? The first place where you can add a feature will be the restaurant detail page, where users can add restaurant reviews. Here, users will be able to take or choose a picture and apply a filter to their picture. They will also be able to give the restaurant a rating as well as a review. You will save this data using Core Data.

After that, you will implement the latest iOS 13 features. You will make your app support Dark Mode, which gives your app a fresh and exciting user interface. Then, you will modify your app to work on both iPhone and iPad and make it work on the Mac Catalyst as well using Project Catalyst. After that, you will learn how to develop views using SwiftUI, a great new way of specifying what the user interface should look like. Finally you'll modify your app to use Sign in with Apple, to further personalize the app to a user.

When you have added some bells and whistles, you can test the app with internal and external testers, and finally get it into the App Store.